Optoelectronic properties of GaP:Ti photovoltaic devices

IF 7.1 3区材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Materials Today Sustainability Pub Date : 2024-10-17 DOI:10.1016/j.mtsust.2024.101008

J. Olea , J. Gonzalo , J. Siegel , A.F. Braña , G. Godoy-Pérez , R. Benítez-Fernández , D. Caudevilla , S. Algaidy , F. Pérez-Zenteno , S. Duarte-Cano , A. del Prado , E. García-Hemme , R. García-Hernansanz , D. Pastor , E. San-Andrés , I. Mártil

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Abstract

Supersaturated GaP is of interest for the photovoltaic field since optical transitions at energies below the bandgap (2.26 eV) could enhance the overall device efficiency up to theoretically 60%. We have previously demonstrated that Ti supersaturated GaP can be obtained by means of ion implantation and pulsed-laser melting with high structural quality and measured its below-bandgap photoconductivity. In this work we report the first results of a GaP:Ti based photovoltaic device. We have fabricated and measured photovoltaic devices with a GaP:Ti absorber layer showing enhanced external quantum efficiency at wavelengths above 550 nm. Also, we have measured the absorption coefficient (around 10⁴ cm⁻¹) and refractive index of this absorber layer. Finally, current-voltage curves in darkness were measured and analyzed using a two-diodes model, showing improvable characteristics. Ideas to enhance the properties of the devices are suggested.

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GaP:Ti 光电器件的光电特性

由于能量低于带隙（2.26 eV）的光跃迁可将整体设备效率提高到理论上的 60%，因此过饱和 GaP 在光伏领域备受关注。我们之前已经证明，可以通过离子注入和脉冲激光熔化的方法获得钛过饱和 GaP，而且结构质量很高，并测量了其低于带隙的光导率。在这项工作中，我们首次报告了基于 GaP:Ti 的光伏器件的研究结果。我们制作并测量了带有 GaP:Ti 吸收层的光伏器件，结果表明，在波长超过 550 纳米时，该器件的外部量子效率有所提高。此外，我们还测量了该吸收层的吸收系数（约 104 cm-1）和折射率。最后，我们使用双二极管模型测量并分析了黑暗环境下的电流-电压曲线，结果表明其特性得到了改善。此外，还提出了增强设备特性的建议。

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来源期刊

Materials Today Sustainability Multiple-

CiteScore

5.80

自引率

6.40%

发文量

174

审稿时长

32 days

期刊介绍： Materials Today Sustainability is a multi-disciplinary journal covering all aspects of sustainability through materials science. With a rapidly increasing population with growing demands, materials science has emerged as a critical discipline toward protecting of the environment and ensuring the long term survival of future generations.